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Novel 8-quinolinol derivatives, 7-bromo-5-methoxymethyl-8-quinolinol (HBrO1Q) and 7-iodo-5-methoxymethyl-8-quinolinol (HIO1Q), were synthesized by halogenating 5-methoxymethyl-8- quinolinol at the 7-position. From the distribution behavior of the reagents between carbon tetrachloride and water, an increase in hydrophobicity and acidity by the halogenation was confirmed. Furthermore, a remarkable increase in the extractability of the Cu(II) ion was found. It was shown that HIO1Q had the extraction constant of Cu(II) which is the highest in 8-quinolinols reported so far

Effect of Halogenation of 5-Alkyloxymethyl-8-quinolinol Derivatives at 7-Position on Extraction Capability of Copper(II) Ion